Array Lists, Searching arrays and Iterators

Question 1

Consider the following code.

public static void main(String[] args) {
    ArrayList list = new ArrayList();
    list.add(3);
    list.add(2);
    list.add(1);
    list.add(0);
    deleteEntry(list,2);
    System.out.println(list.get(2));
}

static void deleteEntry(ArrayList list, int index){
list.remove(index);
}

What is output when the main method is executed?

Answer 1

0

Question 2

What is the correct way to access an item with an index of 4 in an ArrayList of Strings called list?

Answer 2

String x = list.get(4);

Question 3

If ArrayList’s indexOf method is called, with a value that does not exist in the array list, what is returned?

Answer 3

-1

Question 4

True or False?
Arrays can hold primitive and object types
ArrayLists can hold only object types

Answer 4

True

Question 5

True or False?

Iterators work with standard Arrays as well as ArrayLists

Answer 5

False

Question 6

What method lists all the safe ways to delete items in an array list whilst looping through it?

Answer 6

Using an Iterator

Question 7

True or False?

An ArrayList may be created with an initial capacity

Answer 7

True

Question 8

What is the correct way to get the number of items in an ArrayList called carsList?

Answer 8

carsList.size()

Question 9

How can the contents of an ArrayList be most easily placed in a standard Array?

Answer 9

Using the ArrayList’s toArray() method